Which statement about matter is correct? A)
Ima mattet molecules never stop moving.
B)
B
In the solid state, molècules stop moving.
2
Pressure and temperature do not affect matter.
D)
Liquids have a lower level of energy than solids.

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

Identify the correct mole ratio for each substance. sodium chloride (nacl) na: cl = 1: ammonium nitrate (nhno) h: o = 4:

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?